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130+0.40x=60+0.90x
We move all terms to the left:
130+0.40x-(60+0.90x)=0
We add all the numbers together, and all the variables
0.40x-(0.90x+60)+130=0
We get rid of parentheses
0.40x-0.90x-60+130=0
We add all the numbers together, and all the variables
-0.5x+70=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-70
x=-70/-0.5
x=+140
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