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3x + 4 + 2x + 7 = 90
We simplify the equation to the form, which is simple to understand
3x+4+2x+7=90
We move all terms containing x to the left and all other terms to the right.
+3x+2x=+90-4-7
We simplify left and right side of the equation.
+5x=+79
We divide both sides of the equation by 5 to get x.
x=15.8
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