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10x ÷ 2 = 7 → 10x = 2 × 7 → x = (2 × 7) ÷ 10 → 2x = 2 × (2 × 7) ÷ 10 = 2.8
2x+52=0 =>2x= -52 =>x= -52/2 =>x= -26
4x - 7 = 2x + 5 2x - 7 = 5 2x = 12 x = 6.
-3(x-5)=2x
6 - (2 x 7) - (3 x (-9)) = 19