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21x+7-15x=8x+15-4x
We simplify the equation to the form, which is simple to understand
21x+7-15x=8x+15-4x
We move all terms containing x to the left and all other terms to the right.
+21x-15x-8x+4x=+15-7
We simplify left and right side of the equation.
+2x=+8
We divide both sides of the equation by 2 to get x.
x=4
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