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How to solve the equation (36 + x) / (6 + x) = 4?
(36+x)/(6+x)=4
36+x=4(6+x)
36+x=24+4x
4x-x=36-24
3x=12
x=4
How to solve the equation 4 * 36-2 (12 + x) = 36?
4*36-2(12+x)=36
144-（24+2x）=36
144-24-36=2x
2x=84
x=84÷2
x=42
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