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15\left(1\times 2+1\right)s=18\left(-5^{2}\right)+10\times 3^{2}
Multiply both sides of the equation by 30, the least common multiple of 2,5,3.
15\left(2+1\right)s=18\left(-5^{2}\right)+10\times 3^{2}
Multiply 1 and 2 to get 2.
15\times 3s=18\left(-5^{2}\right)+10\times 3^{2}
Add 2 and 1 to get 3.
45s=18\left(-5^{2}\right)+10\times 3^{2}
Multiply 15 and 3 to get 45.
45s=18\left(-25\right)+10\times 3^{2}
Calculate 5 to the power of 2 and get 25.
45s=-450+10\times 3^{2}
Multiply 18 and -25 to get -450.
45s=-450+10\times 9
Calculate 3 to the power of 2 and get 9.
45s=-450+90
Multiply 10 and 9 to get 90.
45s=-360
Add -450 and 90 to get -360.
s=\frac{-360}{45}
Divide both sides by 45.
s=-8
Divide -360 by 45 to get -8.