∧1. DESTRUYE PARENTESIS
X-2X+8+3X-15=X-3
2X-7=X-3
2X-X=-3+7
X=4
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x+5+2x-5x-4x+20=x-3
5+3x-9x+20=x-3
-6x-x=-3-5-20
-7x=-28
x=-28:7
x=-4
espero que te sirva
∧
1. DESTRUYE PARENTESIS
X-2X+8+3X-15=X-3
2X-7=X-3
2X-X=-3+7
X=4