Solve 1.28=left(1*10^15-xright)*6.63*10^-15

$$1.28 = \left( 1 \times { 10 }^{ 15 } -x \right) \times 6.63 \times { 10 }^{ -15 }$$

Solve for x

$$x=\frac{535000000000000000}{663}\approx 8.069381599 \cdot 10^{14}$$

Steps for Solving Linear Equation

Calculate 10 to the power of 15 and get 1000000000000000.

$$1.28=\left(1\times 1000000000000000-x\right)\times 6.63\times 10^{-15}$$

Multiply 1 and 1000000000000000 to get 1000000000000000.

$$1.28=\left(1000000000000000-x\right)\times 6.63\times 10^{-15}$$

Calculate 10 to the power of -15 and get \frac{1}{1000000000000000}.

$$1.28=\left(1000000000000000-x\right)\times 6.63\times \frac{1}{1000000000000000}$$

Multiply 6.63 and \frac{1}{1000000000000000} to get \frac{663}{100000000000000000}.

$$1.28=\left(1000000000000000-x\right)\times \frac{663}{100000000000000000}$$

Use the distributive property to multiply 1000000000000000-x by \frac{663}{100000000000000000}.

$$1.28=\frac{663}{100}-\frac{663}{100000000000000000}x$$

Swap sides so that all variable terms are on the left hand side.

$$\frac{663}{100}-\frac{663}{100000000000000000}x=1.28$$

Subtract \frac{663}{100} from both sides.

$$-\frac{663}{100000000000000000}x=1.28-\frac{663}{100}$$

Subtract \frac{663}{100} from 1.28 to get -\frac{107}{20}.

$$-\frac{663}{100000000000000000}x=-\frac{107}{20}$$

Multiply both sides by -\frac{100000000000000000}{663}, the reciprocal of -\frac{663}{100000000000000000}.

$$x=-\frac{107}{20}\left(-\frac{100000000000000000}{663}\right)$$

Multiply -\frac{107}{20} and -\frac{100000000000000000}{663} to get \frac{535000000000000000}{663}.

$$x=\frac{535000000000000000}{663}$$