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(4*(x+7))/7 = -3 // + 3
(4*(x+7))/7+3 = 0
(4*(x+7))/7+(3*7)/7 = 0
4*(x+7)+3*7 = 0
4*x+49 = 0
(4*x+49)/7 = 0
(4*x+49)/7 = 0 // * 7
4*x+49 = 0
4*x+49 = 0 // - 49
4*x = -49 // : 4
x = -49/4
x = -49/4
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