Solve for y
y=210
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180-0.4y+30=0.6y
Use the distributive property to multiply 0.4 by 450-y.
210-0.4y=0.6y
Add 180 and 30 to get 210.
210-0.4y-0.6y=0
Subtract 0.6y from both sides.
210-y=0
Combine -0.4y and -0.6y to get -y.
-y=-210
Subtract 210 from both sides. Anything subtracted from zero gives its negation.
y=210
Multiply both sides by -1.
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