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70+.50x=30+.90x
We move all terms to the left:
70+.50x-(30+.90x)=0
We add all the numbers together, and all the variables
.50x-(.90x+30)+70=0
We get rid of parentheses
.50x-.90x-30+70=0
We add all the numbers together, and all the variables
-0.4x+40=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-40
x=-40/-0.4
x=+100
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