x+36
x+36+4×x
x+36+(4x)=144
x+36-36+4x=144-36
x+4x=108
5x=108
5x÷5=108÷5
x=21,6
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x+36
x+36+4×x
x+36+(4x)=144
x+36-36+4x=144-36
x+4x=108
5x=108
5x÷5=108÷5
x=21,6