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x+4*3x*2=90
We move all terms to the left:
x+4*3x*2-(90)=0
Wy multiply elements
x+24x*2-90=0
Wy multiply elements
x+48x-90=0
We add all the numbers together, and all the variables
49x-90=0
We move all terms containing x to the left, all other terms to the right
49x=90
x=90/49
x=1+41/49
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